Improvement in grinding-lathes



G. FEST. Grinding-Lathe.

No. 215,901. Patented May 27, 1879.

Vv'ihvess es:

I l I I v A J 0 2 N. PETERS. FHOTO-LXTHCGRArnER, WASHINGTON. D C- UNITEDTATES PATENT OFFICE CHARLES FEST, OF NEW YORK, N. Y., ASSIGNOR TO GEORGEI FARMER,

OF MONT CLAIR, N. J.

IMPROVEMENT IN GRlNDlNG-LATHES.

Speciilcation forming part of Letters Patent No. 215,901, dated May 27,1879; application filed December 20, 1878.

To all whom it may concern:

Be it known that I, CHARLES FEST, of the city, county, and State of NewYork, have in vented a new and Improved Lathe for Working Pearl andother Goods, of which the following is a specification.

Figure 1 is a top view, partly in section, of my improved lathe. Fig. 2is a cross-section of the same.

Similar letters of reference indicate correspondin g parts in all thefigures.

This invention has for its object to adapt a lathe for the turning ofarticles made of m'other-of-pearl-such as sleeve-buttons,&c.whichheretofore could only be turned or made by hand, owing to theimpracticability of using stationary cutting tools in connection withthem on a machine. The invention is, however, also applicable to theturning or sawing of other substances on a lathe. 7

ln order to adapt articles of pearl to operation 011 a machine, or viceversa, it is necessary to use rotary cutting or abradin g devices whichare adjustable in every direction, hori zontally as well aslongitudinally; and my invention consists in combining, with the rotaryhead of a lathe, that carries the article of pearl to be turned,arotating cutting-tool, whose sup- 7 port is so iveled" in a slide thatis capable of longitudinal as well as transverse adjustment, the shaftof the rotary tool being revolved by means of an elastic belt, all ashereinafter more fully described.

In the 2 :companying drawings, the letterA represents the frame-work. Bis the head or work-carrier, the same being adapted to receive thearticle, 0, to be turned. D is a rotatmg tool, made of emery or othersubstance, and fitted upon the shaft E, that is hung in a post, F, whichis swiveled or otherwise secured in a plate, G." I

The plate G isf'capable of lateral adjustment on a support, H, and isconnected with a screw, I, by ""nians of which it may be so adjustedlaterally.

The support His placed upon alower plate, J, and can be adjusted thereonlengthwise by means of a suitable screw, L.

It appears that the support F of the shaft E is capable of horizontaldisplacement both in a lateral and longitudinal direction, thuspermitting the tool D to be brought to such parts of the work to beturned as may be requisite to produce the desired shape.

Motion is imparted to the shaft E by means of an elastic belt, M, whichis placed around the driving-shaft N and around a grooved pulley, a,that is mounted upon the shaft E.

It is quite necessary that the belt M should be elastic-namely, that itbe capable of following the lateral and longitudinal displacements ofthe shaft E without losing its hold upon said shaft and its capacity ofrotating the same. Therefore, in the combination specified, the elasticbelt constitutes an important element.

The operation of the machine need hardly be further described.

It is evident that the work to be turned is properly fitted into thehead B, and that thereupon the operator, the belt M having been applied,

regulates the position of the cutting or grind ing edge of the tool D byturning the screws I and L as occasion may require, thus producing allshapes which it may be desired to impart to the article 0.

The invention is also applicable for turning or sawing ivory, wood,metal, or other substances; and a saw may be substituted in the lathefor the rotary tool D.

I do not'confine myself to the use of the 111achine on pearl.

I claim as my invention- In combination with the laterally andlongitudinally adjustable shaft E, having grooved pulley a, the elasticbelt M, arranged to follow the movements of the shaft E, and to retainits hold upon the said shaft, substantially in the manner specified.

CHARLES FEST.

Witnesses: A

T. B. MOSHER, W. H. 0. SMITH.

